Cut the zucchini into 5mm (2 in.) rounds
Heat the olive oil in a pan. Add the zucchini and sauté.
Once the zucchini is soft, add the shio-koji and sauté for another minute.
Cut the peppers into 1 cm (½ in.) pieces
Heat the butter or oil in a pan. Add the peppers and sauté.
Once the peppers are soft, add the shio-koji and sauté for another minute.